JP5698604B2 - Installation method of precast plate at the first stage in slope reinforcement method - Google Patents

Description

  The present invention relates to an installation method of a first stage precast plate in a method of reinforcing a slope, that is, a natural steep slope, a cut slope, or a slope having been subjected to surface protection.

  Conventionally, slope reinforcement methods include so-called `` reverse winding construction '' where a precast plate is installed in parallel at the uppermost end of the slope, and then the precast plate is installed in parallel on the lower end side. There is so-called “forward winding construction” in which precast plates are sequentially installed in parallel to the upper end side after being installed in parallel.

  The applicant of the present application holds a patent on the former “reverse winding” as a reinforcement method for stabilizing the cut slope. A step portion having a mounting surface having a height capable of installing the first precast plate and a mounting surface on which the precast plate can be placed is excavated and formed on the mounting surface with a certain gap from the mounting surface. Next, precast plates are arranged in parallel, then drilled from the through hole of each precast plate to the mounting surface side, and a rod-like reinforcing material such as a reinforcing bar is inserted into the drilled portion from the through hole, and then the drilled portion and the precast Inject mortar into the gaps on the back side of the board, fix the protruding parts of the reinforcing material to the precast board, connect them to the precast board and fix the precast board on the mounting surface, then install the concrete precast board on the second step from the top Possible height A step having a mounting surface and a mounting surface on which the precast plate can be mounted is formed by excavation, and a second precast plate is formed at the lower end of the first precast plate with a gap between the mounting surface and the mounting surface. After connecting, drilling from the through hole provided in the second stage precast plate and inserting the rod-shaped reinforcing material from the through hole into the drilled part, the back side of the drilled part and the second stage precast plate Cement milk, mortar, and other backfilling materials are injected into the gaps, and the protruding ends of the reinforcing material are fixed to the precast plate side and connected to the second precast plate. It is a reinforcement construction method such as a cut slope characterized by forming a reinforced cut surface provided with a plate, and according to this patented invention, the construction to install the precast plate simultaneously with the earth retaining, in order from the top, Because it is "reverse winding construction" It can be reduced, the amount of earthwork can be reduced, the construction period can be shortened, and the precast plate can be secured, so that it can be made into a permanent structure with high reliability, and the slope is a precast plate, so the appearance is good and precast. The effect that the aesthetics can be further improved depending on the finish of the plate is great (see, for example, Patent Document 1).

Japanese Examined Patent Publication No. 7-26402 ([Claims], [Effects of the Invention], FIGS. 1 to 9)

  However, in the above prior art, after the first stage precast plate is installed, the next stage step portion is excavated. Because it is supported only by the support piles composed of injected solidified mortar and rod-shaped reinforcing material, there is a slight possibility that the first stage precast plate will be lowered during the next stage excavation process, etc. There was a problem that had to be solved.

  In the slope reinforcement method by reverse winding construction based on the above-mentioned prior art, the present invention is precast on the slope of a natural mountain in light of the problem that the first stage precast plate may be lowered during the next excavation process. The step of excavating and forming a step having a wide gap between the mounting surface to be excavated and mounting the plate and the precast plate, and reinforcing the ground in the portion of the step closer to the mounting surface of the mounting surface A step of driving a pile, a step of installing the precast plate in the stepped portion with a gap between the mounting surface, and a step of drilling through the through hole of each precast plate to the ground from the mounting surface A step of screwing and tightening a nut through a washer capable of closing the through-hole to a protruding end portion penetrating the through-hole in the rod-shaped reinforcing member inserted into the drilled-hole portion, and a grout material in the drilled portion Inject the solidified grout The first stage precast plate is formed by having a step of forming a support pile with a material and a rod-shaped reinforcing material, and a step of injecting a backfill material into the gap between the back surface and the mounting surface of the precast plate. The above-mentioned problem is solved by fixing to the natural ground side through a backfill layer formed on a wide mounting surface and having increased integration with the natural ground by the reinforcing pile.

  In short, the present invention is that a precast plate having a through hole penetrating to the back side in the center of the plate integrally fixed at the center of the front surface is installed in parallel on the upper end side of the slope of the natural ground, and then the precast plate is sequentially applied to the lower end side In the method of installing the first stage precast plate in the slope reinforcement method to be installed in parallel, the step where the precast plate is placed on the slope and the gap between the excavated mounting surface and the precast plate is wide. A step of excavating and forming a portion, a step of driving a reinforcing pile into a natural ground at a portion near the mounting surface of the mounting surface in the stepped portion, and a gap between the precast plate in the stepped portion and the mounting surface The step of drilling through the through hole of each precast plate and drilling in the ground from the mounting surface, and the protruding end portion penetrating the through hole in the rod-shaped reinforcing material inserted into the drilled portion, Penetration A step of screwing and tightening a nut through a washer that can be closed, a step of injecting a grout material into the drilled hole portion to form a support pile body with a solidified grout material and a rod-shaped reinforcing material, and And a step of injecting a backfill material into the gap between the back surface and the mounting surface, so that the first stage precast plate is formed on a wide mounting surface and integrated into the natural ground by the reinforcing pile. Since it can be fixed to the natural ground through the backfill layer with increased properties, even if the next step is excavated, the precast plate in the first step does not fall, thus building a reinforced slope safely and accurately Its practical effect is great.

It is a longitudinal cross-sectional view of the reinforcement slope by the slope reinforcement construction method which concerns on this invention. It is a principal part expanded sectional view which shows the excavation process and the pile driving process of a reinforcement pile. It is a principal part expanded sectional view which shows a precast board installation process and a drilling process. It is a principal part expanded sectional view which shows a rod-shaped reinforcing material insertion and nut tightening process, and a grout material injection | pouring process. It is a principal part expanded sectional view which shows a backfilling material injection | pouring process and a cover body insertion process.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
In the precast plate for slope reinforcing method according to the present invention, as shown in FIG. 1, a rectangular precast plate main body 1 and a rectangular recess 2 formed at the center of the surface of the precast plate main body 1. And a cover body 3 to be fitted into the.

In the precast plate body 1, a metal plate 4 is provided at the bottom of the recess 2, and a through hole 5 that penetrates the plate 4 and the precast plate body 1 is formed in the center of the recess 2.
In the cover body 3, a nut housing recess 6 is formed in the center of the back surface.

  2 to 5 are enlarged cross-sectional views showing the main parts of each step of the slope reinforcing method such as the cut slope according to the present invention, a precast plate mounting surface excavation step, a pile driving step, a precast plate installation step, It has a drilling process, rod-shaped reinforcing material insertion / nut tightening process, grout material injection process, and backfilling material injection process.

[Drilling process and pile driving process] (See Fig. 2)
The slope 10 of the natural ground M of the height which can arrange | position the first precast board is excavated, the step part 11 comprised by the mounting surface 11a and the mounting surface 11b is formed, and the mounting surface 11b in this step part 11 is formed. The pile body 12 is driven into a part near the mounting surface 11a.
The step portion 11 is formed so that a gap 13 between the precast plate to be placed and the mounting surface 11a can be secured sufficiently wide, and the head of the pile body 12 protrudes from the step portion 11 and will be described later. Embedded in the backfill layer 19.

[Precast plate installation process and drilling process] (See Fig. 3)
The precast plates 1, 1a,... Are arranged and fixed on the mounting surface 11b of the stepped portion 11 while securing a gap 13 between the mounting surfaces 11a, and then each precast plate is removed by a drilling machine (not shown). 1, 1a... Is drilled through the mounting surface 11a to form a drilling portion 14 having a predetermined depth in the ground M.

[Insertion of rod-shaped reinforcing material / nut tightening process and grout material injection process] (See Fig. 4)
A nut 17 is screwed and tightened through a washer 16 to an end protruding from the plate surface of a bar-like reinforcing member 15 such as a reinforcing bar inserted into the hole 14 and then, for example, cement milk is inserted into the hole 14. Then, a grout material such as mortar is injected, and the support pile body 18 is formed by the cured grout material and the rod-shaped reinforcing material 15.

[Backfilling material injection process and cover body insertion process] (see FIG. 5)
A backfill material such as cement milk or mortar is placed in the gap 13 and cured to form a backfill layer 19, and finally a cover body 3 is fitted into the recess 1 of each precast plate 1, 1a. Include.

  After the next stage, the slope 10 is excavated to a height that allows the precast board to be installed to form the next stage, but the gap between the precast board to be placed and the mounting surface is narrower than the first stage. As shown in FIG. 1, a precast plate installation process, a backfilling material injection process, a drilling process, a rod-shaped reinforcing material insertion process, a grout material injection process, a nut tightening process, and a cover body fitting process are sequentially performed. In addition, a reinforced slope W having precast plates in a plurality of stages is constructed.

1 Precast board body 2 Recess 3 Cover body 4 Plate 5 Through hole
10 slope
11 steps
11a Mounting surface
11b Mounting surface
12 Reinforced pile
13 Clearance
14 Drilling part
15 Rod reinforcement
16 Washer
17 Nut
18 Support pile
19 Backfill layer

Claims (1)

Slope reinforcement in which a precast plate with a through-hole penetrating to the back side in the center of the plate fixed to the center of the front surface is installed in parallel on the upper end side of the slope of the natural ground, and then the precast plate is installed in parallel on the lower end side In the method of installing the first stage precast plate in the method of construction,
The step of placing the precast plate on the slope, excavating and forming a step having a wide gap between the mounting surface to be excavated and the precast plate;
A step of driving a reinforcing pile into a natural ground at a portion near the mounting surface of the mounting surface in the stepped portion,
Installing the precast plate in the stepped portion with a gap between the mounting surface;
A process of drilling through the through hole of each precast plate and drilling in the ground from the mounting surface;
A step of screwing and tightening a nut through a washer capable of closing the through hole to a protruding end portion penetrating the through hole in the rod-shaped reinforcing member inserted into the drilling hole; and
Injecting a grout material into the drilled hole and forming a support pile with a solidified grout material and a rod-shaped reinforcing material,
A step of injecting a backfilling material into the gap between the back surface and the mounting surface of the precast plate after the completion of each step ;
A slope reinforcement method characterized by having

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